Strength Comes from the Small Things

A kindergarten teacher and a police officer hit it off on a one night stand, but they don't get each others' names - let alone their numbers!
What to do when the police officer has to give a lesson to the class and they come face-to-face again?
Rated: M ((you know what this means. Language and probably sex. If it's offensive to you please don't read this.))
Pairing: GrimmIchi
Yaoi, boy x boy, male x male. Don't like, pLease don't read.